import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:jiu_client/core/utils/date_util.dart';
import 'package:jiu_client/widgets/date_picker_field.dart';

void main() {
  group('date_util', () {
    test('formatYmd 补零', () {
      expect(formatYmd(DateTime(2026, 6, 9)), '2026-06-09');
      expect(formatYmd(DateTime(2026, 12, 31)), '2026-12-31');
    });
    test('parseYmd 解析/容错', () {
      expect(parseYmd('2026-06-19'), DateTime(2026, 6, 19));
      expect(parseYmd('2026-06-19T08:00:00'), DateTime(2026, 6, 19));
      expect(parseYmd(null), isNull);
      expect(parseYmd(''), isNull);
    });
    test('composeYmd 正常组合', () {
      expect(composeYmd(2026, 6, 15), '2026-06-15');
    });
    test('composeYmd 把超界的日 clamp 回当月最大值', () {
      expect(composeYmd(2026, 2, 31), '2026-02-28'); // 平年 2 月
      expect(composeYmd(2024, 2, 31), '2024-02-29'); // 闰年 2 月
      expect(composeYmd(2026, 4, 31), '2026-04-30'); // 4 月 30 天
    });
    test('composeYmd 任一为空返回 null', () {
      expect(composeYmd(null, 6, 15), isNull);
      expect(composeYmd(2026, null, 15), isNull);
      expect(composeYmd(2026, 6, null), isNull);
    });
  });

  group('DatePickerField', () {
    testWidgets('渲染三个年/月/日下拉框', (tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Scaffold(
          body: DatePickerField(value: '2026-06-19', onChanged: (_) {}),
        ),
      ));
      await tester.pumpAndSettle();
      expect(find.byType(DropdownMenu<int>), findsNWidgets(3));
    });

    testWidgets('初始值回显到三个下拉框', (tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Scaffold(
          body: DatePickerField(value: '2026-06-19', onChanged: (_) {}),
        ),
      ));
      await tester.pumpAndSettle();
      expect(find.widgetWithText(DropdownMenu<int>, '2026'), findsOneWidget);
      expect(find.widgetWithText(DropdownMenu<int>, '6'), findsOneWidget);
      expect(find.widgetWithText(DropdownMenu<int>, '19'), findsOneWidget);
    });
  });
}